Dynamic Performance Analysis And Noise Reduction Research Of Water Supply System

With the application of a practical engineering, this paper carries on an investigation in the dynamic performance of water supply system. The vibration mechanism of pipelines and the factors that affect pipelines' vibration are analyzed. An approximate analysis of the function of liquid in pipelines is also given. The main contents are as follows:By means of power spectrum analysis, coherence analysis, modal analysis and finite element method (FEM), the identification of noise sources of water supply system is successfully achieved.The vibration mechanism of pipelines is studied in the paper. And pressure pulsation, which is usually the main reason of pipelines' vibration, is discussed in theoretical aspect.The modal analysis of the pipelines in water supply system is carried out by the method of experimental modal analysis and finite element analysis. The natural frequencies of the pipelines structure are obtained. And the results of the two methods agree well with each other. Depend on the compare of two FEM models, a useful law is found. It shows that the natural frequencies have a descendent tendency with the affect of the liquid in pipelines. From the modal analysis, it can be said that the main reason of the noise pollution of water supply system is the resonant vibration which is caused by pressure pulsation. The conclusion is successfully applied in the vibration and noise reduction of the system.With all of the research works, some corresponding measures, which are used to rebuild the water supply system, are put forward. The goal of vibration and noise reduction is achieved. Changing the structure of pipelines to avoid resonant vibration with pressure pulsation is the main rule. Buffer is applied to change the natural frequencies and reduce pressure pulsation. Other measures, such as properly using braces and vibration isolation settings, reasonably selecting and arranging pipelines element, are also applied. All of the measures can be the design rules of vibration and noise reduction- in the practical engineering.